Pen



FIG. 1 is a front elevational view of a pen showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a perspective view thereof;

FIG. 8 is another perspective view thereof;

FIG. 9 is a perspective view with the cap detached thereof;

FIG. 10 is a perspective view with the cap attached on back thereof; and,

FIG. 11 is a perspective view with another pen attached on back.

The broken lines in FIGS. 5 and 11 are included for the purpose of illustrating portions of the pen that form no part of the claimed design. 

CLAIM The ornamental design for a pen, as shown and described. 